Pyrimidine compound and processes



Patented June 24, 1947 PYR'IMIDINE COMPOUND AND PROCESSES FOR MAKING THE SAME Francis Henry Swinden Curd and Francis Leslie Rose, Blackley, Manchester, England, assignors to Imperial Chemical Industries Limited, a corporation of Great Britain No Drawing. Application September 25, 1944, Serial-No. 555,750. In Great Britain September Claims.

This invention relates to newpyrimidine compounds and to processes for manufacturing the same. The said new compounds, which will be more closely defined hereinafter, may be described broadly as pyrimidines bearing in the 2- position an arylguanidino group, free from acidic substituents, and in the 4-position a strongly basic substituent derived from a diamine which is at least in part aliphatic or alicyclic. and optionally bearing hydrocarbon substituents in the 5- and fi-positions. ,They are useful as .chemotherapeutic agents and have properties such as make them particularly valuable as parasiticidal agents, especially againstthe malaria parasites.

It is an object of this invention toprovide new pyrimidine compounds. A. further object is to provide new chemotherapeutic agents. ther object is to provide new and valuable antimalarial agents. Another object ls'to provide processes for manufacturing new pyrimidine compounds. .A further object is to provide processes for making new antimalarial agents. Further objects will appear hereinafter as the description proceeds. These and other objects are achieved by the following invention.

The said new compoundsare pyrimidine derivatives of the formula N=o-x Ar.l IHC(NH)NH- -Y l-Na"-A-NRR wherein X and Y, which are not necessarily alike,

' each represent hydrogen ora hydrocarbon radical or X and Y together may represent a divalent aliphatic hydrocarbon radical which forms with the 5- and B-carbon atoms an alicyclic ringgAr may bear one or more simple nea -acidic substit'u ents such, for example, as hydrocarbon radicals (which themselves may optionally bear substituents and which may be attached to the .arylgroup directlyor'through an oxygen or s'ulphur atom or through an i'inino, sulphonyl or' carbonylt roup), halogen atoms or cyano, nitro amino, acylamino, hydroxyl or esterified carboxyl groups, 9B, is hydrogen or an alkyl or simply substituted. alkyl group, for example an alkoxyalkyl or dialkylaminoalkyl group, A is a linking groupwhich is aliphatic or alicyclic or aliphaticr-carbocyclic'and may be, substituted, for example, by hydrocarbon radicals, hydroxy or alkoxy groups, or, dialkylaminoalkyl groups and, where A'or part of A is an aliphatic chain itmay be interrupted by oxygen or sulphur atoms or iminogroups, and NRR is a strongly basic amino or substituted amino A fur- 2 h v group such as alkylamino or dialkylamino or piperidino or other strongly basic nitrogen-containingheterocyclic group.

We make the said new compounds by a process comprising the interaction. of 'a diamine NHR"--A--NRR' with an appropriate 2-arylguanidinopyrimidine bearing in the 5- and 6-' positions the groups X and Y respectively and in the 4-position a. labile group such as a halogen atom or a hydrocarbon radical whichis attached by" means of an ether or thioether linkage, for example, an alkoxy, aryloxy or alkylmercapto group. H u i The-reaction, is conveniently brought about by heating the reagents together, optionally in presence or a solvent or diluent. If desired, the arylguanidlnopyrimidine or the diamine may be used in the form of a salt, such as the hydrochloride or acetate. Also if desired the reaction may be carried out in the presence of an acidbinding agent such as sodium hydroxide.

hydrolysis.

The reagents are conveniently, but not necessarily, used in approximately stoichiometric proportions. Actually we prefer to use about 1.25 molecular proportions of the diamine, but the proportions arenot critical and if desired a large excess of. the amine may bev used so that it functions as a solvent or diluent.

An alternatlve, modified process, applicable in those cases where the radical NRR of the diamine represents a primary amino group, is to protect this group, as by acylation, during the condensation with the pyrimidine compound and then subsequently to remove the protecting radical. This process is preferable in many such cases and, as will be appreciated, must be adopted where it is desiredto introduce a diamino substituent of the type '--N.(A lkyl)-- A-NH2, since if the primary amino. group is not so protected, reaction with the pyrimidine compound will occurthere instead of atthe secondary nitrogen atom. The final hydrolysis is performed by known, methods, as, for example, by heating the acyl compound with a dilute mineral acid or with a dilute alkali. 1

The invention therefore includes also a modifled process for making those compounds wherein the basic 4-substituent is of the form NR' -A-NH2 which comprises the interaction of the pyrimidine intermediate with an acyl derivative of the diamine and subsequent regeneration of the primary amino group by The 4 halogeno 2 arylguanidinopyrimidine compounds used as starting materials may be 4 chloro --2 (3':5' dibromophenylguani made by reaction of a halogenating agent such as phosphorus oxychloride or oxybromide upon the corresponding 4-hydroxy compounds (themselves produced by interaction of appropriate arylbiguanides and formylacetic esters) as is described in our copending application Ser. No. 555,752.

The alternative starting materials containing.

ether or thioether groups can readily be made by 7 interaction of the 4-haiogeno-derivatives with appropriate hydroxy or mercapto compounds or with alkali metal deriyativesof such compounds.

As examples of suitable arylguanidinopyrimidine intermediates there may be mentioned,

4 chloro 2 phenylguanidino 6 methyl- 4-- chloro 2 (4' m'ethoxyphenylguanidino) fi-methylpyrimidine,

v 4 chloro 2 (4' methylmercaptophenyl guanidino) -6-methylpyrimidine,

4 chloro 2 (3' chlorophenylguanidino) 6 methylpyrimidine,

4 chloro 2 (2' chlorophenylguanidino) 6 methylpyrimidine,

4 chloro 2 (3 methylphenylguanidino) fi-methy lpyrimidine,

4 chloro 2 (2' methylphenylguanidino) fi-methylpyrimidine,

4 chloro 2 (2'z4 dichlorophenylguani dino) -6-methylpyrimidine,

4 chloro 2 (3':4 dichlorophenylguani dino) -6-methylpyrimidine,

4 chloro 2 (3:5' dichlorophenyiguani dino) -6-methy1pyrimidine,

4 chloro 2 (2'z5' dichiorophenylguani dino) -6-methylpyrimidine,-

4 chloro 2 (2' methyl 4' chlorophenyl guanidino) -6-methyl-pyrimidine,

4 chloro 2 (3 chloro 4' methylphenyl guanidino) -6-methy1pyrimidine,

4 chloro 2 (4' phenylphenylguanidino) G-methylpyrimidine,

4 chloro 2 (3:4' dimethylphenylguani dino) -6-methylpyrimidine,

4 chloro 2 (3':5'- dimethylphenylguani dino) -6-methylpyrimidine.

4 chloro 2 (2 methoxyphenylguanidino) S-methylpyrimidine,

dino) -6-methy1pyrimidine;

4 chloro 2 (4' dimethylaminophenylguani dino) -6-methylpyrimidine,

4 chloro 2 (4' chlorophenylguanidlno) 6 phenylpyrimidine,

4 chloro 2 (4 chlorophenylguanidino) 5 phenylpyrlmidine,

' 4 chloro 2 (4 methoxyphenyiguanidino) 5-phenyipyrimidine,

4 chloro 2 (4 chlorophenylguanidino) -5 methylpyrimidine,

4 chloro 2 (4' chlorophenylguanidino) 5:6-dimethylpyrimidine,

4 chloro 2 (4' chlorophenylguanidino) 5 ethyl-G-methylpyrimidine. I

4 chloro 2 (4' iodophenylguanidino) 6 methylpyrimidine,

4 chloro 2 (4' fiuorophenylguanidino) 6 methylpyrimidine,

4 chloro 2 (4' bromophenylguanidino) -.6

methylpyrimidine,

4 chloro 2(3' chloro 5 methoxyphenyl guanidino) -6-methylpyrimidine,

4 chloro 2 (2 s 'naphthylguanidino) 6 methylpyrimidine,

4 chloro 2 (6 bromo 2' naphthylguani dino) -6-methylpyrimidine,

4 chloro 2 (6' methoxy 2' naphthyl guanidino) -6-methylpyrimidine,

4 chloro 2 (1 naphthylguanidino) 6 methylpyrimidine,

4 chloro 2 (4' chloro 1 naphthylguani dino) -6-methylpyrimidine,

4 chloro 2 (4' ethoimphenylguanidino) 6 methylpyrimidine, I

4 chloro 2 (4 n butylphenylguanidino) G-methylpyrimidine,

4 chloro 2 (4' carbomethoxyphenylguani dino) -6-methylpyrimidine,

4 chloro 2 (4' phenyl phenylguanidino) 6-methylpyrimidine,

4 chloro 2 (4 nitrophenylguanidino) 6 methylpyrimidine,

4 chloro 2 (4' cyanophenylguanidino) 6 methylpyrimidine,

4 chloro 2 (4 chlorophenylguanidino) 5 benzyl-fi-methylpyrimidine,

4 chloro 2 (4' acetylaminophenylguani dino) -6-methylpyrimidine,

4 chloro 2 (4' chlorophenylguanidino) 5 6 7 8-tetrahydroquinazoline,

4 chloro 2 (4' chlorophenylguanidino) 5 B-trimethylenepyrimidine,

4 chloro 2 (4 methylsulphonylphenyl guanidino) -6-methylpyrimidine, and

4 chloro 2 (4' dimethylaminosulphonyl phenylguanidino) -6-methylpyrimidine,

and likewise the corresponding 4-bromo, 4-phenoxy, 4-ethoxy, 4-methylmercapto, 4-ethylmercapto and 4-phenylmercapto compounds.

As examples of suitable diamines there may be mentioned ethylenediamine, 2-dimethylamin0- ethylamine, 3 dimethylaminopropylamine, N-methyl N diethyl ethylenediamine, 3 di ethylaminopropylamine, 4 diethylaminobutyl amine, 4 diethylamino 1 methylbutylamine, 3 diethylamino 1:2 dimethylpropylamine, 3-diethylamino-2-hydroxypropylamine, 2-methylaminoethylamine, 3 n butylaminopropyl amine, 3-diethylaminoethoxypropylamine, 3-diethylaminoethylmercaptopropylamine, 5-diethylamino 1 -'aminopentane, 2-pyrrolidinoethylamine, 1:3-bis-diethylamino 2 aminopropane, N ethyl N p diethylaminoethyl ethylenediamine, N methyl -VN p diethylaminoethyl ethylenediamine, 2-pideridinoethylamine, 3-piperidinopropylamine, bis (p diethylamino ethyl) amine, p dimethylaminoethoxyaniline, p diethylaminoethoxyaniline, p dlethylaminoethylmercaptoaniline, 3-diethylamino 2:2 dimethylpropylamine, 3-di n butylaminopropylamine, N-methyl-N 18 diethylaminoethyl trimethylenediamine and p-piperdino-a-methyl- 66 ethylamine.

These 2-arylguanidinopyrimidines bearing a basic substituent in the 4-posltion and optionally bearing hydrocarbon substituents in the 5- and 6-positions are new compounds. They are colourless crystalline solids which are strongly basic and form colourless salts with mineral and organic acids. The salts with mineral acids such as hydrogen halides, sulphuric and phosphoric acids or with lower organic acids such as acetic, lactic, tartaric and lower alkanesulphonic acids Die. The salts with acids of higher molecular (e. g. methane-sulphonic acid) are water-solu- 7 weight such as methylene bis-2:3-hydroxynaph thoic acid and methylene bis-salicylic acid are more sparingly soluble in water. Those compounds in which the arylguanidino group is a phenylguanidino group substituted in the p-position are particularly useful antimalarial agents. The following examples illustrate, but do not limit, the invention. Theparts are by weight.

Eiample 1 A mixture 0133.4 parts of the hydrochloride of 2-mchlorophenylguanidino-4:chloro-fi-methylpyrimidineand 12.8 parts of p diethylaminoeethylamine is heated at 120-130 C. for 1 hour.

The resulting melt is dissolved ,in 400 parts of hot dilute acetic acid: After cooling, the solution is basified with dilute caustic soda.

ethylaminoethylamino)-pyrimidine, is liberated as an oil and solidifies on standing. It is collected, washed with water and dried in vacuo ov erflsolid caustic soda. Finally it is recrystallised from petroleum ether (13. P..100-120 C.) when it forms colourless prisms which melt at 154 155 c. um

corn). i

It is sparingly soluble in water but forms salts with organic and mineral acids which are freely For example, the dihydrochloridecan soluble. be obtained as a dry crystalline powder by evapcrating an aqueous solution containing one equivalent of the base with two equivalents of hydrochloric acid, or by adding two equivalents of concentrated hydrochloric acid toa solution of one equivalent of the base in acetone. In the same way the diacetate can be obtained asa colourless crystalline solid by using two equivalents of acetic acid instead of the hydrochloric acid.

Example 2 A mixture of 29.8 parts of Z-p-chlorophenyh guanidino 4 chloro-fi methylpyrimidine, 17.4 parts of fl-diethylaminoethylamine, 250 parts of chlorobenzlene, and 200 parts of aqueous caustic soda of 6% strength, is stirred and heated under reflux for 2 hours. The mixture is then distilled in steam to remove the solvent, and the crude 2-p-chlorophenylguanidino-dl- (p diethylamincethylamino)-6-methylpyrimidine separates out. It is collected, washed with water, dried in vacuo over solid caustic soda and finally recrystallised from petroleum ether. It is identical with the product of Example 1.

Example 3 The base, 2-p-chlorophenylguanidino 6 -,methy1 4-"( 8-di-" data given are (i) the 4-halogeno-2-arylguanldinopyrimidine used as starting material, (ii) the diamine used, which, combined with the halogeno compound yields the end-product indicated 1 (iii). Thenumber of parts listed after each conrpound is theamount of that compound to be used as starting material in the synthesis. Melting points uncorrectedl of the new compounds formed are given. The 4-halogeno -z-arylguanidinc-pyrimldines are-in some cases used as the free base and in others (which are indicated) as Example 6 2-s-naphthylguanidino-4-chloro-6 methyipyrimidine hydrochloride, 34.8 parts; Y-diethylaminopropylamine, l6 parts: 2-p-naphthylguanidino-4-Y-diethylaminopropylamino 6 methylpyrimidine, M, P. 130 c. l

U Example 7 2-p-elilorophenylguanldinol'chloro G-methylpyrimidine, 29.8 parts; p-pyrrolidinoethylamine, 16.5 parts; 2-p-chiorophenylguanidino 4-fi-Dyrrolidinoethylamino fi-methylpyrimidine, M. P.

Example 8 r l 2 A- pchlorophenylguanidino 4 chloro 6- methylpyrimidine, 29.8 parts; N ethyl N diethylaminoethyl-ethylene diamine','16 parts; 2- p-- chlorophe nylgiianldino 4-3- ,(N-ethyl-N-p diethylaminoethynalninoethylamino -6- methylpyrlmidine, M. P. 102-103.5.C.

Example 9 2-p-chlorophenylguanidino-4- chloro-8-methylpyrimidine, 29.8 parts; -n-butylamino'propyl- *amine, 15*parts; z-p-ch1orophenylguanidino-4-qn butylaminopropylamino-6-methylpyrimidine,

A mixture of 33.4 parts or thehydrochlorlde of 2-p-chlorophenylguanidino-4-chloro-6-methylpyrimidine, 16 parts of fl-diethylaminoethylamine and 16 parts of glacial acetic acid are heated together at 130 C. for 30 minutes. To the viscous solution so obtained 500 parts of water are added and the solution is boiled and filtered from insoluble by-products. The filtrate is' added to an excess of dilute caustic soda] solution. Crude 2-p-chlorophenylguanidino 4-p-diethylaminoethylamino-B-methylpyrimidine is precipitated. It is filtered of! and purified as described in the preceding examples.

For convenience the following examples are given in abbreviated form. Examples 4-6 are carried out by the method of Example 1, Exam-v ples 7-18 by the method of Example 2 andExamples 19-49 as described in Example 3. u The Example 10 2 p chlorophenylguanidino 4- chloro 6 methylpy'rimidine, 29.8 parts; 7 (p' diethylaminoethoxy) -propylamine, 32 parts; 2-p-chloroiphenylguanidino -4-'y (p'f-diethylaniinoethoxylpropylamino 6 methylp yrimidine, M. P. 123- Example 11 2 p chlorophenylguanidino 4 chloro 6- methylpyrimidine, 29.8-'parts; N-methyl-N-p-diethylaminoethyl-trimethylenediamine, 36 parts: 2-,p-chlorophenylguanidino -4-'y- (N-methyl-N- p diethylaminoeth'yl) aminopropylamino-fimethylpyrimidine, M. P. IMP-' C. l

Example 12 2-p-chlorophenylguanidino-il chloro-G-methylpyrimidine, 29.8 parts; 1:3-bisdiethylamino-2- aminopropane, ao parts; 2 p 5 chlorophenyl- M. P. 134-135? C.

Example 34 2 phenylguanidino 4 chloro 6 methylpyrimidine hydrochloride, 29.8 parts; B-diethyL- aminoethylamine, 13 parts; 2-pheny1guanidino- 4- 3-diethylaminoethylamino-fimethylprimidine,

M. P. 119-120 C.

Example 35 i 2 p methylsulphonylphenylguanidino 7 4 chloro 6 methylpyrimidine, 33.5 parts; diethylaminoethylamine, 20 parts; 2-p+methy1- I methoxyphenylguanidinoi-bchloro 6 methylsulphonylphenylguanidino 4 .1 fl-diethylaminov ethylamino 6. methylpyrimidine, M. P. 15.2-- 154 C.

Example 36 Z-phenylguanidino 4 chloro 6 methylpyrimidine hydrochloride; 29.8 partsf y-diethyl aminopropylamine. 18 parts; Z-phenylguanidino-4-y-diethylaminopropylamino- ,6 methylpyrimidine, M. P. 127-128 C.

Emample37x Z-p-anisylguanidino 4 chloro 6 methylpyrimidine hydrochloride, 32.9 parts; p-diethyL- aminoethylamine, .14 parts, 2-p-anisylguamdino- '4- ,3-diethylaminoethy1amiho 6 methylpyrimidine, M. P. 185-486 C.

. 4 Example 38 Z-p-dimethylaminosulphohyl phenylguanidino" 4-chloro-G-methylpyrimidine, 37.0 parts, fi-diethylaminoethylamine, 18.5 parts; Z-p-dimethylaminosulphonylphenylguanidino-4-p diethylaminoethylamino-6-methy1pyrimidine, M. P. 149- 150 Example '39 I 2-prdin'iethylaminophenylguanidino-4 chlorofi-methylpyrimidine, 306 parts; 'p-diethyIamino-L ethylamine, 17.6 parts; 2-p-dimethylam1nophen-' ylguanidino 4 p diethylaminoethylamino -6 methylpyrimidine, M. P. 182 -184 0.

Example 40 V ylpyrimidine hydrochloride, 33.4 parts; p-diethyl aminoethylamine, 18 parts; 2 my-chlorophenyl:

guanidino-4-p-diethylaminoethylamlno 6- meth- I ylpyrimidine, M. P. 149 C.

Example 41 2-(4'-chloro 2' methylphenylguanidino) 4- chloro-6-methylpyrimidine, 31.2 parts; ,e-diethylaminoethylamine, 18 parts; 2-(4'-chloro-2- methylphenylguanidino) -4-,B-diethylaminoethylamino-6-methylpyrimidine. M. P. 138-139 C.

Example 42" pyrimidine. M. P.

1 z-or chlorophenyla'uanidino-4-chioro-6 methylpyrimidine hydrochloride, 33.4 parts; p-diethylaminoethylamine, 16.5 parts; 2-o-ch1orophenylguanidino-4-p-diethylaminoethylamlno-fi-mlethylpyrimidine, M.P. 130 C.

1 Example 46 fi-methylpyrimidine hydrochloride, 32.7 parts; 9- diethy1aminoethylamine,- 14 parts; 2-(3 :4'-dimethylphenylguanidino) -4-.B-diethylaminoethylamino-firmethylpyrimidine, M. P. 132-134 C.

Example 47 dine hydrochloride, 22.8 parts; fi diethylaminoethylamine, 13.9 parts; 2-o-tolylguanidino-4-pdiethylaminoethylamino- 6 methylpyrimidine. M. P. 104-106? c. v

Example. 48

- 2-p-chlorophenylguansldino-4-chloro-5:a 6 trimethylenepyrimidine, 32.4 parts; s-diethylaminoethylamine, 15 parts; z-p-chlorophenylguanidino-4-p-diethy1arninoethy1amino-5:6 trimethylehepyrimidine, M P. saw- 102 'c. w

Example 49 2'-p-chiorophenylguanidino-4-chl0ro 5 6 7 8- tetrahydroqulnazoline, 33.8 parts; ,a-diethylami l 2-m-chlorophenylguanidino-4-chloro-6- meth- 2- 2' 5'-dichlorophenylguanidino) '-4-cmero amethylpyrimidine, 33.3 parts; ,B-dimethylaminoethylamine, 1 7 parts; 2-(2':5'-dichlorophenylguanidino) 4 fldiethylaminoethylamino 6 methylpyrimidine, M. P. 129-130 C. 1

Example 43 2-m-tolylguanidino-4-chloro 6- methylpyrlmidine hydrochloride, 31.3 parts; Q-diethylaminoethylamine, 12.5 parts; 2-m-tolylguanidino-4-{3- diethylaminoethylamino 6 methylpyrimidine,

Example 44 Q r .2-(3'-chloro;5'-me thoxyphienylguanidino) 4- chloro-fi-methylpyrimidine, 32.9.parts; p-diethylaminoethylamine, 18 parts; 2-(3'-ch10ro-5'-' noethylamine, 14.5 parts; z-p-chlorophenylguanidino-4-B-diethylaminoethy1amino-5 6 7 B-tetra hydroquinazoline, M. P. 159-160 C.

Example 50 A mixture oi! 33.8 parts of 'z-p-chlorophenylguanid1no 4 phenoxy 6 methylpyrimidine. 12

parts of fi-diethylaminoethylamine and 40 parts of glacial acetic acid is heated for 2 hours in an oil -bath kept at 140 C. After cooling somewhat, the still molten reaction mixture is added to;400 parts of cold water and the solution so obtained -is filtered to remove a little insoluble matten Thefiltrate is made strongly alkaline by addingan excess of caustic soda. The semi- 1 lution at 130C. for 1 hour. When recrystallised frombutyl alcohol it melts at 1B 'l-188 Q uncorra Example 51 x i A mixture 01 30.6 parts or Z-p-ch lorophenylguanidino 4 ethoxy-fi-methylpyrimidine, 30 parts of .e-diethylaminoethylamine and 40 parts "of glacial acetic acid 'isheated for 2 hours in an oil-bath kept at -120 C. After cooling, the

still molten reaction mixture is added to 400 parts of cold water and made acid to Congo red by the addition of hydrochloric acid of 36% strength.

i Any unchanged 2-p-chlorophenylguanidino-4- ethoxy-S-methylpyrimldine is precipitated as the sparingly soluble hydrochloride and is filtered 011. The filtrate is made strongly alkaline by adding' an excess of caustic soda. The semi- 11 solid precipitate is washed with water by decantation and recrystallised from petroleum ether. The product is 2-p-chlorophenylguanidino- 4 a ,3 diethylaminoethylamino-6methylpyrimidine. When pure it forms colourless crystals which melt at 154-155 C.

The 2 p-chlorophenylguanidino-4-ethoxy-6- methylpyrimidine used as starting material in the above example is made by heating the corresponding 4-chloropyrimidine with sodium ethoxide in dry ethyl alcohol. from ethyl alcohol it melts at 149-150 C.

Example 52 A mature of 30.8 parts r 2-p-chlorophenyl- .10 When recrystallised v guanidino 4 methylmercapto-B-methylpyrimi-'"' and is filtered oif. The flltrate is made strongly alkaline by adding an excess of caustic soda;

The semi-solid precipitate is washed with water by decantation and dried in vacuo over solid caustic potash. The dry product is recrystallised from acetone. It is z-p-chlorophenylguanidino 4 p diethylaminoethylamino-B- methylpyrimidine and melts at 154-155 C. I

The 2 p chlorophenylguanidino-4-methylmercapto-B-methylpyrimidine used as starting material in the above example is made by heating the corresponding 4-chloropyrimidine with sodium methylmercaptide in bollingmethyl alcohol solution. It can be recrystallised from aqueous methanol, when it forms colourless prisms which melt at 147-149 C. uncorr.

In some cases the substituent on the'aryl radi- V cal of the/final g -basically-substituted 2-arylguanidinopyrlmldine can be quite simply chemically modified to produce other compounds coming within the general formula given above and active as, parasitickial agents. Thus, for instance, 2 p nltrophenylguanidino-4-p-diethylamlnoethylamino-6-methylpyrimidine is readily hydrogenated in methanbl in presence of a Raney nickel catalyst to yield the corresponding amino compound M. P.143-144 C. 7

Likewise the terminal amino group of the basic 4-substituent may be modified to produce other compounds coming within the general formula given above and active as parasiticidal agents.

For instance, in those cases where the 4-sub-,

stituent has a terminal primary amino group'it may be monoand di-alkylated or converted to piperidino, pyrrolidino or other strongly basic nitrogen-containing heterocyclic group, or where it has a terminal monoalkylamino group that may be converted toadialkylamino group. I

Whereas the above description and examples illustrate many widely varied embodiments of the invention, it will be apparent to one skilled in the art that many other embodiments and variations may be devised without departing from the spirit and scope thereof and accordingly it is to be understood that the invention is not in any way limited except as defined in the following claims.

We claim: r

1. as new compounds, the free base form and 12 salts of the pyrimidine derivatives of the formum- I ei=c-x ArNHC(NH)NH-C -Y NCNR-ANRR wherein Ar is an aromatic radical having not more than 10 carbon atoms in its cyclic skeleton and having its extranuclear valencies satisfied by attachment to members selected from the group consisting of hydrogen, alkyl, phenyl, alkyloxy, halogen. nitro and cyano; the pair of symbols X and Y represent substituents selected from the following group namely: (a) a single divalent aliphatic hydrocarbon radical which forms with 5- and 6-carbon atoms an alicyclic ring, (1)) two hydrocarbon radicals, (0) one hydrocarbon radical and one hydrogen atom, and (d) two hydrogen atoms; R" is a member of the group consisting of hydrogen, alkyl, alkoxyalkyl and dialkylaminoalkyl; A is a linking radical selected from the group consisting of aliphatic, alicyclc and aliphatic-carbocyclic radicals; and NRR' represent a basic radical selected from the group consisting of primary, secondary and tertiary amines and heterocyclic nitrogenous bases. 2. Process for the manufacture of pyrimidine compounds as defined in claim 1, which comprises reacting a diamine of the form NHR"ANRR.', as defined below, with a 2- arylguanidino-pyrimidine of the formula wherein J designates a labile substituent selected from the group consisting of halogen, alkoxy, aryloxy and alkylmercapto, Ar is an aromatic radical having not more than 10 carbon atoms in its cyclic skeleton and having its extranuclear valencies satisfied by attachment to members selected from the group consisting of hydrogen, alkyl, phenyl, alkyloxy, halogen, nitro and cyano; the pair of symbols X and Y represent substituents selected from the following group, namely: (a) a single divalent aliphatic hydrocarbon radical which forms with 5- and G-carbon atoms an alicyclic ring, (b) two hydrocarbon radicals, (0) one hydrocarbon radical and one hydrogen atom, and (d) two hydrogen atoms; R" is a member of the group consisting of hydrogen,

alkyl, alkoxyalkyl and dialkylaminoalkyl; A is a linking radical selected from the group consisting of aliphatic, alicyclic and aliphatic-carbocyclic radicals; and NPR represents a basic radical selected" from the group consisting of primary, secondary and tertiary amines and heterocyclic nitrogeneous bases.

3. As new compounds, the free base form and salts of the pyrimidine derivatives of the formula N=CCH| n-Nn-omm-rmn -tJ-NR"-A-NRR' wherein Ar is an aromatic radical having not more than 10 carbon atoms in its cyclic skeleton and having its extranuclear valencies satisfied by attachment to members selected from the group consisting of hydrogen, alkyl, phenyl, alkyloxy, halogen, nitro and cyano; R" is a member of the group' consisting of hydrogen, alkyl, alkoxyalkyl and dlalkylaminoalkyl; A is a linking radical selected from the group consisting of aliphatic, allcyclic and aliphatic-carbol3. cyclic radicals; and NRR. represents a base radical selected from the group consisting of primary, secondary and tertiary amines and heterocyclic nitrogenous bases.

4. As new compounds, the free base form and salts of the pyrimidine derivatives of the formula wherein Ar is an aromatic radical having not more than 10 carbon atoms in its cyclic skeleton and having its extranuclear valencies satisfied by attachment to members selected from the group consisting of hydrogen, alkyl, phenyl, alkyloxy, halogen, nitro and cyano, and NRR' represents a basic radical selected from the group consisting ofprimary, secondary and tertiary amines and heterocyclic nitrogenous. bases.

5. As new compomids, the free base form and salts oi! the pyrimidine derivatives of the formula N=C-CH;

ArNHC(NH)NH- on NCNHalkyleneZ wherein Ar is an aromatic radical having not more than 10 carbon atoms in its cyclic skeleton and having its extranuclear valencies satisfied by attachment to members selected from the group consisting of hydrogen, alkyl, phenyl,

alkyloxy, halogen, nitro and cyano, and wherein Z designates the radical of a dialkyl amine attached at its N-atom.

. l4 6. As new compounds, the free base form and salts oi! the pyrimidine derivatives of the formula o -r=o-cm DNH-c NB -NH-c on .c' l NH-olkylene--Z wherein G and G represent monovalent substltuents of the group consisting of hydrogen,

halogen, nitro, alkyl, alkoxy, phenyl, and cyano, while Z designates the radical or a dialkyl amine attached at its N-atom.

7. A compound selected from the group consisting of the free base form and salts of 2-pchlorophenyl guanidino-6-methyl-4-(p-diethylaminoethylamino) -pyrimidine.

8. Acompound selected from the group consisting of the free base form and salts 012-pnitrophenyl guanidino-6-methyl-4-(fi-diethylaminoethylamino) -pyrimidine.

9. A compound selected from the group consisting of the free base form and salts of 2-pcyanophenyl guanidino-G-methyl-4-(p-dlethylaminoethylamino) -pyrimidine.

10. Process for the manufacture of pyrimidine compounds as defined in claim 5, which comprises reacting'the corresponding 2-arylguanidine-4-halogeno-6methyl-pyrimidine with an alkylene diamine of formula NHz--a1kylene-Z, wherein Z designates the radical or a dialkyl amine attached-at its N-atom.

FRANCIS HENRY SWINDE'N CURD. FRANCIS LESLIE ROSE. 

